Oh, that's a really interesting case! I hadn't seen any like that when I posted, but that's definitely something to consider. I think you could work around when

Oh, that's a really interesting case! I hadn't seen any like that when I posted, but that's definitely something to consider. I think you could work around whenever you get multiple "perfect" fits like that by comparing a) whether they are non-blank, or, more sophisticated, b) are there continuous edges across the boundary.